Yamivpp saturation/contrast output should be same with input when set the value to 50.

[feiwan1]

For example: yamivpp --con 50 1280x720.NV12 out_contrast_50_1280x720.NV12 yamivpp --sat 50 1280x720.NV12 out_sat_50_1280x720.NV12

The input file should be bitmatch with output.